fs/udf/ialloc.c

   1 /*
   2  * ialloc.c
   3  *
   4  * PURPOSE
   5  *      Inode allocation handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * CONTACTS
   8  *      E-mail regarding any portion of the Linux UDF file system should be
   9  *      directed to the development team mailing list (run by majordomo):
  10  *              linux_udf@hpesjro.fc.hp.com
  11  *
  12  * COPYRIGHT
  13  *      This file is distributed under the terms of the GNU General Public
  14  *      License (GPL). Copies of the GPL can be obtained from:
  15  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  16  *      Each contributing author retains all rights to their own work.
  17  *
  18  *  (C) 1998-2001 Ben Fennema
  19  *
  20  * HISTORY
  21  *
  22  *  02/24/99 blf  Created.
  23  *
  24  */
  25
  26 #include "udfdecl.h"
  27 #include <linux/fs.h>
  28 #include <linux/locks.h>
  29 #include <linux/quotaops.h>
  30 #include <linux/udf_fs.h>
  31
  32 #include "udf_i.h"
  33 #include "udf_sb.h"
  34
  35 void udf_free_inode(struct inode * inode)
  36 {
  37         struct super_block * sb = inode->i_sb;
  38         int is_directory;
  39         unsigned long ino;
  40
  41         ino = inode->i_ino;
  42
  43         /*
  44          * Note: we must free any quota before locking the superblock,
  45          * as writing the quota to disk may need the lock as well.
  46          */
  47         DQUOT_FREE_INODE(inode);
  48         DQUOT_DROP(inode);
  49
  50         lock_super(sb);
  51
  52         is_directory = S_ISDIR(inode->i_mode);
  53
  54         clear_inode(inode);
  55
  56         if (UDF_SB_LVIDBH(sb))
  57         {
  58                 if (is_directory)
  59                         UDF_SB_LVIDIU(sb)->numDirs =
  60                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) - 1);
  61                 else
  62                         UDF_SB_LVIDIU(sb)->numFiles =
  63                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) - 1);
  64
  65                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
  66         }
  67         unlock_super(sb);
  68
  69         udf_free_blocks(sb, NULL, UDF_I_LOCATION(inode), 0, 1);
  70 }
  71
  72 struct inode * udf_new_inode (struct inode *dir, int mode, int * err)
  73 {
  74         struct super_block *sb;
  75         struct inode * inode;
  76         int block;
  77         uint32_t start = UDF_I_LOCATION(dir).logicalBlockNum;
  78
  79         sb = dir->i_sb;
  80         inode = new_inode(sb);
  81
  82         if (!inode)
  83         {
  84                 *err = -ENOMEM;
  85                 return NULL;
  86         }
  87         *err = -ENOSPC;
  88
  89         block = udf_new_block(dir->i_sb, NULL, UDF_I_LOCATION(dir).partitionReferenceNum,
  90                 start, err);
  91         if (*err)
  92         {
  93                 iput(inode);
  94                 return NULL;
  95         }
  96         lock_super(sb);
  97
  98         if (UDF_SB_LVIDBH(sb))
  99         {
 100                 struct logicalVolHeaderDesc *lvhd;
 101                 uint64_t uniqueID;
 102                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(sb)->logicalVolContentsUse);
 103                 if (S_ISDIR(mode))
 104                         UDF_SB_LVIDIU(sb)->numDirs =
 105                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) + 1);
 106                 else
 107                         UDF_SB_LVIDIU(sb)->numFiles =
 108                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1);
 109                 UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
 110                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 111                         uniqueID += 16;
 112                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 113                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
 114         }
 115         inode->i_mode = mode;
 116         inode->i_uid = current->fsuid;
 117         if (dir->i_mode & S_ISGID)
 118         {
 119                 inode->i_gid = dir->i_gid;
 120                 if (S_ISDIR(mode))
 121                         mode |= S_ISGID;
 122         }
 123         else
 124                 inode->i_gid = current->fsgid;
 125
 126         UDF_I_LOCATION(inode).logicalBlockNum = block;
 127         UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 128         inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
 129         inode->i_blksize = PAGE_SIZE;
 130         inode->i_blocks = 0;
 131         UDF_I_LENEATTR(inode) = 0;
 132         UDF_I_LENALLOC(inode) = 0;
 133         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE))
 134         {
 135                 UDF_I_EXTENDED_FE(inode) = 1;
 136                 UDF_UPDATE_UDFREV(inode->i_sb, UDF_VERS_USE_EXTENDED_FE);
 137         }
 138         else
 139                 UDF_I_EXTENDED_FE(inode) = 0;
 140         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 141                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 142         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 143                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 144         else
 145                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 146         inode->i_mtime = inode->i_atime = inode->i_ctime =
 147                 UDF_I_CRTIME(inode) = CURRENT_TIME;
 148         UDF_I_UMTIME(inode) = UDF_I_UCTIME(inode) =
 149                 UDF_I_UCRTIME(inode) = CURRENT_UTIME;
 150         UDF_I_NEW_INODE(inode) = 1;
 151         insert_inode_hash(inode);
 152         mark_inode_dirty(inode);
 153
 154         unlock_super(sb);
 155         if (DQUOT_ALLOC_INODE(inode))
 156         {
 157                 DQUOT_DROP(inode);
 158                 inode->i_flags |= S_NOQUOTA;
 159                 inode->i_nlink = 0;
 160                 iput(inode);
 161                 *err = -EDQUOT;
 162                 return NULL;
 163         }
 164
 165         *err = 0;
 166         return inode;
 167 }